For what it is worth. I experienced 2 times a similar problem with my Rotax
912s.
About 4 years ago for the first time and it was figured out that 1 of the wires
of 1 of the ignition boxes was broken close to the connector. The wire was
soldered which solved the problem.
A few weeks ago it happened again. So I checked the wires but with no result.
Furthermore
I checked the spark plug leads, spark plug connectors, pull off force,
etc. replaced all the spark plugs but no results.
Eventually the problem was located by a local Rotax dealer who discovered a
faulty
ignition coil. The error in the ignition coil could not be detected by
measurement
but only by swapping parts. Hence it was a real pain to find out.
Good luck.
Kees de Bussy
PH-SBR
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